package com.heima.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component

public class AuthorizeFilter implements GlobalFilter, Ordered {

    //全局过滤器
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登录
        String path = request.getURI().getPath();
        if (StringUtils.contains(path,"/login/in")) {
            return chain.filter(exchange);
        }

        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return  response.setComplete();
        }

        Claims claims = AppJwtUtil.getClaimsBody(token);

        int result = AppJwtUtil.verifyToken(claims);
        if (result == 0 || result == -1) {
            String userId = claims.get("id").toString();
            ServerHttpRequest httpRequest = request.mutate().headers(httpHeaders -> httpHeaders.add("userId", String.valueOf(userId))).build();

            ServerWebExchange webExchange = exchange.mutate().request(httpRequest).build();
            return chain.filter(webExchange);
        }
        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return  response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
